Docs for bevy::asset::io::android are not generated

## Bevy version and features

Both 0.18.1 and main

## What you did

I tried to look up how docs for bevy::asset::io::android were generated by bevy workflows because I didn't manage to do it locally, and found that they were missing.

## What went wrong

https://dev-docs.bevy.org/bevy_asset/io/index.html doesn't list `android` as a submodule.

## Additional information

The android module is gated under
`#[cfg(target_os = "android")]`
which apparently disables doc generation for it.